US3561922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste sulphite liouor recovery
Assignee: Babcock and Wilcox Co
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Filing: 1969-09-08
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Granted: 1971-02-09
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Expires: 1989-09-08
Abstract
Abstract A CHEMICAL AND HEAT RECOVERY SYSTEM WHEREIN MAGNESIUM BASE PULP RESIDUAL LIQUOR IS BURNED IN A FLUID COOLED FURNACE TO PRODUCE PARTICLE-FORM MAGNESIUM OXIDE AND SULPHUR DIOXIDE. SUPPLEMENT FUEL IS ADDED WHEN NECESSARY WITH THE PULP RESIDUAL LIQUOR TO MAINTAIN COMBUSTION GAS TEMPERATURES ABOVE A PREDETERMINED VALUE TO ELIMINATE CARBON PARTICLES FROM THE COMBUSTION PRODUCTS. COMBUSTION AIR DELIVERED TO THE FURNACE WITH EITHER OR BOTH FUELS IS CLOSELY CONTROLLED TO AVOID FORMATION OF SULPHUR TRIOXIDE IN THE PRODUCTS OF COMBUSTION.
Inventors
- 👤 Robert K Allen
- 👤 John L Clement
- 👤 Henry P Markant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:16
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; C01F; C01F5/00; C01F5/02; C01F5/06; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |